Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e871c1c94cfb68b…

MALICIOUS

PDF

90.9 KB Created: 2021-08-19 06:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4275ddb492800b8aa22cfee3958aa949 SHA-1: 9b951b556f0d7f40c6a9f73a9a5cd31f78cd5dbf SHA-256: 5e871c1c94cfb68b077fec5165e04e5fd8c9f1bba9012b1d68c84160ce810fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=how+to+prepare+for+a+behavioral+interview+indeed PDF link annotation
    • http://nebovsem.ru/app/webroot/files/files/xulikoginidexafonafiduxev.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a9708ba9---63307048521.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/11640693758.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a38fe3cadde39c52086594381b7aa454/79421967819.pdfIn PDF document text
    • http://superpart.com/files/midovubalakubolinajop.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/58628718180.pdfIn PDF document text
    • http://clarasonic.com/upload/file/54740953090.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-19/images/files/90835164274.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/rafuwe.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6j5njknl9kt0dkvjruhtkl3tr9/wufuvodaw.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/13678684322.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c33c3ca795---48864297192.pdfIn PDF document text
    • https://0900107678.com/upload/file/87478052680.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/50027594f119750f910cfec8ad862500/9349062523.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/32313136335.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/pubafuvoluwusizo.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/bofizesugi.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/561e66537b67d860d5822db19493f780/tawak.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afde2e8e199---kexarenajepudebalo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18b711335---topuvegerupeto.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/86333730122.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f15075e63f668481767b64056d896932/wesukurebikatedit.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/91511868458.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608497ad1df6d.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 16340 bytes
SHA-256: 8bd06494f8ac529456df9d657ed4a477f5b2cf8c79e0993dd2b65d9a47d1de68
font_01_sfnt_off00012ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEB 10712 bytes
SHA-256: cd9cb8b453c8f06f87d3c1cc3c865f58ba5fdc21f9e9602b05f2459a6348fe23
font_02_sfnt_off00014533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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